Dental instrument.



.L. A. GHAMBERLIN & C. H. WILLIAMS.

DENTAL INSTRUMENT.

APPLIUATION FILED MAY 14, 1014.

Patented Aug. 4, 1914.

THE NORRIS PETERS CO.l FHOTO-LITHO. WASHINGTON. D. C

UNITED STATES PATENT @FFTCE.

LEWIS A. CHAMBERLIN AND CHARLES HMWILLIAMS, OF DE SOTO, MISSOURI.

DENTAL INSTRUMENT.

Specification of Letters Patent.

Patented Ari 41, 1914.

Application filed May 14, 1914. Serial No. 838,571.1

To all whom it may concern:

7 Be it known that we, Lnwrs A. CHAMBER- LIN and Gnarmns H. WILLIAMS, cltlzens of the United States, residing at De Soto, in

we do declare the followingto be a full,

clear,and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

Our invention relates broadly to improvements in dental instruments and more par ticularly to pin extractors.

The primary object of the invention is to provide a device of this character which may be simply and inexpensively constructed and which will be well adapted to the purpose for which it is designed.

A secondary object of the invention is to construct the entire device in such a manner as to allow the same to be readily dis sterilizing.

A still further object is to so position a clamp, to be described, as to prevent un-l due springing of theljaw members;

With these objects in view, the invention resides in certain novel features of construction and combination herein described and claimed and shown in the drawingswherein Figure 1 is a side elevation of a pin ex-l tractor constructed in accordance with our invention. Fig. 2 is an edge view thereof. Fig. 3 is a central vertical section. Fig. 4 is a section taken at right angles to Fig. 3 and substantially upon the line 1-4 of Fig. 1, and Figs. 5, 6 and 7 are horizontal sections taken respectively upon the lines 5-5, 6-6, and. 7-7 of Fig. 1.

In the accompanying drawings, we have shown our invention as comprising a fixed aw member 1, a movable jaw member 2,

a stop member 3, an operating screw 4:, and a clamp 5 whereby sa d aw members may be moved toward each other.

The fixed jaw member 1 comprises an upright rectilinear :bar 6 which is preferably rectangular in cross section, said bar being provided with, at one end, a transversely projecting ear 7 through which the shank of the operating screw 4 isswiveled and at its opposite end, with an inwardly curved jaw 8 which is preferably reduced in thickness as indicated at 9 and roughened or serrated on its active face. The bar 6 is further provided with a transverse slot 10 which is disposed at a suitable point, said slot 10, the ear 7 and jaw 8 lying in the same upright plane. a

The movable jaw member 2 comprises an upright rectilincarbarll which, like the bar 6, is preferably rectangular in cross section and is provided, on one end, with a transversely extending arm 12 having its terminal reduced ilrwidth as indicated at 13 and loosely mounted within the slot 10, the opposite end of said bar llbeing provided with an inwardly curved jaw 14;, which, like the jaw 8, is reduced in width and serrated upon its active surface.

By reference to the drawings, it will, be clearly seen that the jaws 8 and 14L coact when the parts are assembled, said jaws ber ing forced toward each other by means of the clamp 5, the latter being here shown in the form of a rectangular yoke 15 which is providechat one end, with a stud receiving opening 16 in which a stop stud 17, carried by the jaw member 1, is seated, the opposite end of said yoke being preferably enlarged at its central portion and provided with a threaded bore in which a clamping screw 18 is mounted, the inner end of said screw bearing against the outer surface of the member 2 and thereby moving said member toward the member 1 when tightened.

Interposed between the members 1 and 2 is the stop member 3, the latter comprising a rectilinear bar 19 having one of its ends bifurcated as indicated at 20 to straddle the reduced terminals of the jaws 8 and 14,-, the opposite'end portion of said stop member beingpreferably thickened and provided with a transverse slot 21 which receives the arm 12,,the extreme end of said slotted portion being provided with a threaded bore with which the threads of the operating screw 4 are engaged.

With the parts as above described, the operation of the deviceis as follows: The jaws 8 and 1 1 are positioned uponthe pin 1? to be extracted and the bifurcated end of the stop member 3 is positioned in contact with the outer surface of the root R. The clamping screw 18 is now operated to cause said jaws to rigidly clamp the pin P after which the operating screw 4 is turned ings, it will be seen that we have produced an extremely simple pin extracting device, yet one which will efiectually perform the functions for which-it is desired and which may be readily disassembled for the pur- V pose of cleaning and sterilizing.

Particular emphasis is laid upon the 10- cationof the clamp 5 and its mounting since, by its location, thejaws 8 and 1% may be moved into forcible contact with the pin,

little yielding, on the part of the members i 1 and 2, being allowed. By the herein described mounting of the clamp 5, it will be seen that in order to remove the same, it is simply necessary to retract the screw 18 to an extent sufficient to allow the-stud 17 to be disengaged from the opening 16, where upon said clamp may be readily removed thus allowing the movable member 2 to be disengaged from the members 1 and 3, which latter may be entirely removed by the proper actuation of the operating screw 4.

WVe have described our invention with considerable minuteness but we do not wish to be limited to details of construction other than those amplified in the appendedclaims.

Having thus described our invention, What we claim as new and desire to secure by Letters Patent is:

1. A device of the. character described comprising a fixed rectilinear jaw member having a transverse ear at one end, a transverse jaw at its opposite end, and a transverse slot intermediate its ends, the ear, the jaw, and the slot lying in the same longitudinal plane, a rectilinear movable jaw mem ber lying substantially parallel to said fixed member and spaced therefrom, said movable member having a transverse extension on one end and a transverse jaw on its opposite end, said extension having a reducedterminal slidable in said slot, a rectilinear stop member interposed between said fixed and movable members and having a bifur cated portion straddling said jaws and a transversely and longitudinally slotted portion receiving said transverse extension, a

clamp for moving said movable jaw toward the fixed jaw and a set screw swiveled in said ear and having a threaded engagement with the adjacent end of said stop member.

2. A device of the character described comprising a fixed rectilinear jaw member having a transverse ear at one end, a transverse jaw at its opposite end, and a trans verse slot intermediate its ends, the, ear, the

jaw, and the slot lying in the same longitu dinal plane, a rectilinear movable jaw memcated portion-straddling said :jaws and a. transversely and longitudinally slotted portion receiving ,said transverse extension, a

transverse clamping yoke embracing the two jaw members and the stop member, coactingstops carried'by one jaw member and by one end of the yoke, a clamping screwhaving a threaded engagement with the opposite end of the yoke and bearing againstthe other jaw member and aset screw'swiveled through said ear and having a threaded en-- gagement with the adjacent end of the stop member. I

3. A device of. the character described,

comprising a fixedrectilinear jaw .member having a transverse ear at one end, a transverse jaw at its opposite :end,yanda transverse slot intermediate itsends, the ear, the vj aw, and the slot lying in the same longitu v dinal plane, a rectilineanmovable jaw mem-- ber lying substantially parallel to said fixed member and spaced therefrom, said movable member having a transverse extension on one end'and a transverse jaw on its opposite end, said extension having a reduced-.terminal slldable in said slot, a rectilinear stop member interposed between said fixed and IllOVELbl8'1ZLW members and having a bifur- .cate'd portion straddling said jaws and a transversely and longitudinally slotted;por-. tion receiving said-transverse extensionpa j transverse clamping yoke embracing theftwo jaw members and the stop member and have ing in its opposite ends a stud receiving opening and a threaded opening, a stop stud carried by one jaw" member and disposed'in' said stud receivingopening, a clamping screw in thevthreaded opening and bearing againstthe other jaw member andja'set screw swiveled in said ear and having a threaded engagement withthe adjacent end of the stop member.

In testimony whereof we have hereunto set our hands in presence. of two subscribing witnesses.

LEWIS A. CHAMBERLIN.

Witnesses:

S. A. BELEW, G. E; LOGAN.

Copies of this patent may be obtained. forffive cents each, by addressing the Gommissioner of Patents, v Washington, 1).0.

CHARLES H. WILLIAMS. 

